The article presents the results of studies of the influence of plant density and fertilisation on growth and development processes , elements of the yield structure and yield of maize hybrids of different maturity groups. These studies need to be optimised by taking into account new forms, application rates and timing of their application according to the stages of organogenesis and maturity groups of maize hybrids and their biological requirements. The highest linear measurements of plant height and cob attachment compared to the control variant (tf˃tt0.05) were observed at the maximum intensification of technological methods of maize cultivation in the experimental variant with the combined application of zinc sulfate, Ecoline Zinc and Ecoline Boron on the background of N100P31, and plant density from 60 to 80 thousand plants/ha. plants/ha, which in maize hybrids DCS 3795 increased from 5.7 to 9.2%; DCS 3972 from 9.5 to 12.5%; DCS 4351 from 2.3 to 4.5%, respectively. As well as the highest water content of the cob of maize hybrids, which at a plant density of 60 - 80 thousand plants/ha was higher compared to the control variant (tf˃tt0.05) in DCS 3795 by 30.0 - 32.0%; DCS 3972 by 28.5 - 35.0%; DCS 4351 by 32.7 - 33.2%. The highest yield increase was in maize hybrids compared to the control variant (NIR0.05 fertiliser = 0.11 t/ha): DCS 3795 - 3.53 (42.1%), 3.79 (43.7%), 3.8 t/ha (44.6%); DCS 3972 - 4.16 (44.3%), 4.60 (47.2%), 4.24 t/ha (45.3%); DCS 4351 - 4.23 (45.2%), 4.0 (44.0%), 3.42 t/ha (40.6%), respectively. Thus, the highest yields were recorded for maize hybrids DCS 3795 - 8.67 and DCS 3972 - 9.74 t/ha at a density of 70 thousand plants/ha, and for hybrid DCS 4351 - 9.35 t/ha at a density of 60 thousand plants/ha. Our next research requires studying the optimisation of fertilisation and plant density for starch content, which will increase its yield to increase bioethanol production.